Unreal Engine Issues
Unreal Engine Issues
Level Sequences- Overriding binding of a spawnable mid-playback doesn't despawn spawnable
UE - Anim - Sequencer - Jun 8, 2023Reported by user in UDN. Overriding the binding of a spawnable actor track while the sequence is playing will result in 2 visual copies of the actor, the original spawnable, which doesn't get destr ...
Performance hitch from RemoveGeometryCache flushing the render thread
UE - Editor - Content Pipeline - Alembic - Jun 12, 2025FGeometryCacheStreamingManager::RemoveGeometryCache calls FlushRenderingCommands which shows up as a hitch when profiling. [Link Removed] Ideally the flush added in CL#23782411 to fix a rare deadl ...
ISM Component in an instanced BP does not take into account changes to NumCustomDataFloats from the BP class
UE - Graphics Features - Sep 16, 2022PerInstanceSMCustomData is bulk serialized and doesn't get changed on the BP instance when changing NumCustomDataFloats, possibly causing out of bounds array access leading to a crash. Possible sol ...
UHapticFeedbackEffect_SoundWave Initialize does not populate Raw Data in the HapticsBuffer
UE - Platform - XR - Jul 19, 2024From the UDN: > Open HapticsFeedbackEffect.cpp and naivgate ~ line 150; note HapticBuffer has length populated but never write the actual buffer data. LikeReplySelect as Best Seems like a simple f ...
Crash dragging Sound Wave onto Output node in Newly Created Empty Sound Cue
UE - Audio - Aug 22, 2016A licensee has reported a crash when dragging a Sound Wave onto the Output node within the Sound Cue editor. Regression? This crash does not occur on the 4.11.2 binary release CL-2946394 ...
Translucent Surface Material and Additive Particles not rendering on Metal in Shipping/Distribution
UE - Platform - Mobile - Oct 22, 2015Certain Translucent Materials with Surface Lighting Models and Additive Material based Particle Systems will not render in Shipping/Distribution configuration using Metal Rendering on an iPhone 6*. ...
Spawned actors with meshes become invisible in editor after changing level
UE - Graphics Features - Sep 7, 2018When moving actors spawned from within the editor to a new sublevel, their meshes stop rendering. However, if you open a new level then re-open the old level the meshes become visible again. You wil ...
[CrashReport] UE4Editor-CoreUObject!UObject::SetLinker(FLinkerLoad *,int,bool) [UObjectLinker.cpp:107]
UE - Foundation - Core - May 13, 2019Comment from user in crash group:I updated unreal engine to 4.22.1 and changed the project version from 4.21.2 to 4.22.1 and now it crash whenever i open a map Generated from CrashReporter ...
Skeletalmesh editing can be slow when asset have a lot of morphtarget
UE - Editor - Mar 3, 2020After investigation, the asset is not rebuild, what took time is the 2 following partThe serialization of the DDC where we have to initialize the morph targetsE:\P4\main\Engine\Source\Runtime\Engine ...
Default Hot Key or any key it is set to for Mesh Painting Brush Size doesn't work
UE - Editor - Workflow Systems - May 9, 2022This is a regression – in 4.27.2 the bracket keys do not change the Brush Size even though it is the default hot key. However, changing the hot key to something else works in 4.27.2. Hot Keys are n ...